Omicron
LOS ANGELES, CALIFORNIA – JULY 14: A registered nurse stirs a nasal swab in testing solution after administering a COVID-19 test at Sameday Testing on July 14, 2021 in Los Angeles, California. COVID-19 cases are on the rise in most states as the highly transmissible Delta variant has become the dominant strain in the United States. (Photo by Mario Tama/Getty Images)